Safety-fastener.



No'. 755,174. PATENTD MAR. z2, 1904.

- A. SGHAEBFER.

sAPETYKPAsTENER.

APPLICATION FILED APR-12, i902.

N0 MODEL. l 2 SHEETS-SHEET 1.

- irroNEYsQ THE mams PEfzgs no, wam-una. wnsmncn'ou. n, c.

vNo. 755,174. PATENTED MAR. 22, 1904.

A. SGHAEPFER.

` SAFETY PASTENER.. AP'PLIOATION FILED APB. 12, 1902.

No MODEL. 2 sums-SHEET l2'.

www MMM w@ @M enter the fabric. In order to limit the rotary movement ofPatented March '22, 1904.

PATENT OFFICE.

ARTHUR SCHAEFFER, OF BERLIN, GERMANY.

SAFETY-FASTENER.

SPECIFICATION forming part of Letters Patent No. 755,174, dated March22, 1904.

Application filed April 12, 1902.

vTo all whom t may concern:

Be it known that I, ARTHUR SCHAEFFER, a citizen of the Kingdom ofPrussia, Empire of Germany, and a resident of Berlin, Germany, (whosepost-oflice address is Prinzessinnenstrasse 10,) have invented certainnew and useful Improvements in Safety Fasteners, of which the followingis a specification.

My invention consists in the features and combination and arrangement ofparts hereinafter described, and particularly pointed out in the claims.

In the annexed drawings, Figures l and 2 are respectively a verticalsection andplan view from below of the new fastener, having stops tolimit rotation in both directions. Figs. 3 and 4 are side and bottomviews illustrating a slight modification of the same device. Figs. 5 and6 illustrate a device in which when unscrewed the point of the helicalpin lies underneath a spring-tongue, so that injury to the user inhandling the fastener is avoided. Fig.

7 shows a further modification of the invention-viz., the newsafety-fastener being constructed as a tie-pin with the pin-shaft beingbent in a rectangular knee, while Fig. 8 shows my invention againconstructed as a tie-pin, the needle being only bent in an obtuse angle.

Referring to Figs. l and 2, a is a plate sewed or otherwise fastened tothe materials, and in which plate is rotatably mounted a shank fixed atits upper end in a rotatable milled head c and at its lower end to aplate a. Projecting from the under face of the plate-like part cl is acentral guide-pin e and a helicallycurved pin n, all points of which areequidistant from the axial line of the shank though I do not wish tolimit myself to this particular form of spiral or to having the needleor pin e centrally arranged. This pin e is pointed to thehelically-curved pin n around the axis of the shank b, the plate d isprovided with a tooth f to engage a catch or projection g on the underside of the plate a. By this the rotation of this curved pin n will belimited in both directions. Referring to Figs. 3 and 4:, the base-plateis indicated at a and the ro- The latter is screw-threaded tary pin atb.

sesamo. 102,580. memorial.) Y t and works through the plate a until therotary movement is limited .by either the head c or the plate d comingagainst the plate 0;. By turning the head c hard against the plate a theparts will remain under strongfrictional contact. I

By referring to Figs. 5 and 6 another means of limiting the rotarymovement of the head will be seen, consisting of a spring z., adapted tosnap into an indent or notch in the'side of the rotary head c'. Thespring is supported by the plate a. The plate carrying the helical pinis marked d in this ligure.

In order to avoid prickin-g the fingers by the pointed pins, I provide ashield or springtongue z, attached to the plate a and arranged with itsend over the points of the straight pin e and of the helical pin n,Figs. 5 and 6. The point of the helical pin lies shielded by this tonguewhen the head is turned all the way in one direction to unscrew thehelical pin from the fabric. When being screwed into the fabric, thepoint of the helical pin will move from under the said tongue.

The helical pin-fastener above described canfbe used in varioussituations for attaching articles to fabrics, for fastening ornamentsand the like, also in place of the ordinary press-button fasteners madeup of separate parts.

1. In combinationv a plate a head cl having a pivot 5 rotatably mountedin said plate a plate-like part d carriedv by said pivot t on one sideof said plate a, a helical pin n and means for limiting the amount ofrotation of said parts, substantially as described.

2. In combination a plate a, head c having a pivot rotatably mounted insaid plate, a plate-like part al carried by said pivot on one side ofsaid plate a, a helical pin n and a catch g on the plate a arresting atooth f on the part d for limiting the amount of rotation of the parts cand d, shank b and pin n, substantially as described.

3. In combination a plate a., a head o having a pivot rotatably mountedin said plate, a plate-like part 0l carried by said pivot t on one sideof said plate a, a helical pin n and a spring la catching a notch on thehead o for limiting the amount of rotation of Said parts,

substantially as described.

4. In combination a plate a, a head c having a pivot a plate-like part dfixed to pivot b on one side of said plate a, a helical pin n the pivotb being provided with a screw-thread engaging a thread in the plate afor the purpose of limiting the amount of rotation of the pin n by theabutment of the parts c and l against the upper and under surface ofplate a respectively, substantially as described.

5. In combination a plate al, a head c on one side`thereof having apivot b projecting through an opening in said plate a, a platelike partd carried by said shank b on one side of plate a, a helical pin ncarried by the plate a a suitable bent pin e carried by the part CZcentrally of the helical pin a, and means for limiting the amount ofrotation of said movable parts, substantially as described.

6. In combination a plate a, a head c having a pivot Z) rotatablymounted in said plate, a plate-like part d carried by said pivot on oneside of said plate a, a helical pin n means for limiting the amount ofrotation and means for preventing injury to the user of said parts,substantially as described.

7. In combination a plate a, a head c having a pivot Z) rotatablymounted in said plate, a plate-like part l carried by said pivot on oneside of said plate a, ahelical pin n, a springtongue s fastened to theplate a, and covering the point of the unscrewed helical pin a and meansfor limiting the amount of rotation of said parts, substantially asdescribed.

In testimony whereof I aliX my signature in presence of two Witnesses.

ARTHUR SGHAEFFER.

Witnesses:

WOLDEMAR HAUPT, HENRY HAsPER.

